如何初始化已排序可用空间链表的self._nodes数组

class SortedFreeSpaceList:
    def __init__(self, sorted_list):
        self._nodes = []  # 初始化空的self._nodes数组

        # 遍历已排序的可用空间链表
        for node in sorted_list:
            start_address, size = node['start_address'], node['size']
            self._nodes.append({'start_address': start_address, 'size': size})

        # 根据节点的起始地址对self._nodes数组进行排序
        self._nodes.sort(key=lambda x: x['start_address'])

# 示例用法
sorted_list = [{'start_address': 0, 'size': 100}, {'start_address': 200, 'size': 50}, {'start_address': 300, 'size': 80}]
free_space_list = SortedFreeSpaceList(sorted_list)
print(free_space_list._nodes)